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Related Experiment Videos

Extrafollicular antibody responses.

Ian C M MacLennan1, Kai-Michael Toellner, Adam F Cunningham

  • 1MRC Center for Immune Regulation, University of Birmingham, Birmingham, UK. i.c.m.maclennan@bham.ac.uk

Immunological Reviews
|July 9, 2003
PubMed
Summary
This summary is machine-generated.

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Extrafollicular B cell responses occur outside of follicles and are not found in tissues near internal epithelia. These responses involve immunoglobulin class switching but limited B cell hypermutation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Adaptive antibody responses involve B cell proliferation in germinal centers or extrafollicular foci.
  • Extrafollicular B cell growth occurs in lymph node medullary cords and spleen red pulp.
  • This type of B cell response is absent in secondary lymphoid tissues associated with internal epithelia.

Purpose of the Study:

  • To describe the characteristics and locations of extrafollicular B cell responses.
  • To understand the B cell populations involved in extrafollicular reactions.
  • To delineate the features of immunoglobulin class switching and hypermutation in these responses.

Main Methods:

  • Analysis of B cell localization and proliferation in lymphoid tissues.
  • Immunohistochemistry to identify B cell populations and their locations.

Related Experiment Videos

  • Assessment of immunoglobulin gene rearrangements and mutations.

    • Main Results:

    • Extrafollicular B cell responses form plasmablasts in specific locations like medullary cords and red pulp.
    • Naïve and memory B cells can participate in extrafollicular reactions.
    • These responses exhibit immunoglobulin class switching but minimal B cell hypermutation.

    Conclusions:

    • Extrafollicular B cell responses represent a distinct pathway in adaptive immunity.
    • Their localization and limited hypermutation suggest specific roles in antibody production.
    • Further research is needed to fully elucidate the functional significance of these responses.